<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <title>Document</title>
        <style type="text/css">
            .container .cart {
                width: 300px;
                margin: auto;
            }
            .container .title {
                background-color: lightblue;
                height: 40px;
                line-height: 40px;
                text-align: center;
                /*color: #fff;*/
            }
            .container .total {
                background-color: #ffce46;
                height: 50px;
                line-height: 50px;
                text-align: right;
            }
            .container .total button {
                margin: 0 10px;
                background-color: #dc4c40;
                height: 35px;
                width: 80px;
                border: 0;
            }
            .container .total span {
                color: red;
                font-weight: bold;
            }
            .container .item {
                height: 55px;
                line-height: 55px;
                position: relative;
                border-top: 1px solid #add8e6;
            }
            .container .item img {
                width: 45px;
                height: 45px;
                margin: 5px;
            }
            .container .item .name {
                position: absolute;
                width: 90px;
                top: 0;
                left: 55px;
                font-size: 16px;
            }

            .container .item .change {
                width: 100px;
                position: absolute;
                top: 0;
                right: 50px;
            }
            .container .item .change a {
                font-size: 20px;
                width: 30px;
                text-decoration: none;
                background-color: lightgray;
                vertical-align: middle;
            }
            .container .item .change .num {
                width: 40px;
                height: 25px;
            }
            .container .item .del {
                position: absolute;
                top: 0;
                right: 0px;
                width: 40px;
                text-align: center;
                font-size: 40px;
                cursor: pointer;
                color: red;
            }
            .container .item .del:hover {
                background-color: orange;
            }
        </style>
    </head>
    <body>
        <div id="app">
            <div class="container">
                <my-cart></my-cart>
            </div>
        </div>
        <script type="text/javascript" src="js/vue.js"></script>
        <script type="text/javascript">
            var CartTitle = {
                props: ['uname'],
                template: `
                  <div class="title">{{uname}}商品</div>
                `
            };
            var CartList = {
                props: ['list'],
                template: `
                <div>
                  <div :key="item.id" v-for="item in list" class="item">
                    <img :src="item.img"/>
                    <div class="name">{{item.name}}</div>
                    <div class="change">
                      <a href="" @click.prevent="sub(item.id)">－</a>
                      <input type="text" class="num" v-bind:value="item.num" @blur="changeNum(item.id,$event)" />
                      <a href="" @click.prevent="add(item.id)">＋</a>
                    </div>
                    <div class="del" @click="del(item.id)">×</div>
                  </div>
                </div>
              `,
                methods: {
                    del: function(id) {
                        // 把id传递给fuzujian
                        this.$emit('cart-del', id);
                    },
                    changeNum: function(id, event) {
                        this.$emit('change-num', {
                            id: id,
                            num: event.target.value,
                            type: 'change'
                        });
                    },
                    sub: function(id) {
                        this.$emit('change-num', {
                            id: id,
                            type: 'sub'
                        });
                    },
                    add: function(id) {
                        this.$emit('change-num', {
                            id: id,
                            type: 'add'
                        });
                    }
                }
            };
            var CartTotal = {
                props: ['list'],
                template: `
                  <div class="total">
                    <span>总价：{{total}}</span>
                    <button>结算</button>
                  </div>
                `,
                computed: {
                    total: function() {
                        // 计算商品的总价
                        var t = 0;
                        this.list.forEach(item => {
                            t += item.price * item.num;
                        });
                        return t;
                    }
                }
            };
            Vue.component('my-cart', {
                data: function() {
                    return {
                        uname: '张三',
                        list: [
                            {
                                id: 1,
                                name: 'TCL彩电',
                                price: 1000,
                                num: 1,
                                img: 'img/a.jpg'
                            },
                            {
                                id: 2,
                                name: '机顶盒',
                                price: 1000,
                                num: 1,
                                img: 'img/b.jpg'
                            },
                            {
                                id: 3,
                                name: '海尔冰箱',
                                price: 1000,
                                num: 1,
                                img: 'img/c.jpg'
                            },
                            {
                                id: 4,
                                name: '小米手机',
                                price: 1000,
                                num: 1,
                                img: 'img/d.jpg'
                            },
                            {
                                id: 5,
                                name: 'PPTV电视',
                                price: 1000,
                                num: 2,
                                img: 'img/e.jpg'
                            }
                        ]
                    };
                },
                template: `
                  <div class='cart'>
                    <cart-title :uname="uname"></cart-title>
                    <cart-list :list="list" @cart-del="delCart($event)" @change-num="changeNUm($event)"></cart-list>
                    <cart-total :list="list"></cart-total>
                  </div>
                `,
                components: {
                    'cart-title': CartTitle,
                    'cart-list': CartList,
                    'cart-total': CartTotal
                },
                methods: {
                    delCart: function(id) {
                        // 根据id删除lsit中对应的数据
                        // 1.根据id所对应数据的索引
                        var index = this.list.findIndex(item => {
                            return item.id == id;
                        });
                        // 2.根据索引删除对应数据
                        this.list.splice(index, 1);
                    },
                    changeNUm: function(val) {
                        if (val.type == 'change') {
                            // var index = this.list.findIndex(item => {
                            //     return item.id == val.id;
                            // });
                            // this.list[index].num = val.num;
                            this.list.some(item => {
                                if (item.id == val.id) {
                                    item.num = val.num;
                                    // 终止遍历
                                    return true;
                                }
                            });
                        } else if (val.type == 'sub') {
                            this.list.some(item => {
                                if (item.id == val.id) {
                                    if (item.num >= 1) {
                                        item.num -= 1;
                                    }
                                    // 终止遍历
                                    return true;
                                }
                            });
                        } else if (val.type == 'add') {
                            this.list.some(item => {
                                if (item.id == val.id) {
                                    item.num += 1;
                                    // 终止遍历
                                    return true;
                                }
                            });
                        }
                    }
                }
            });
            var vm = new Vue({
                el: '#app',
                data: {}
            });
        </script>
    </body>
</html>
